720146431 has 4 divisors (see below), whose sum is σ = 725643864. Its totient is φ = 714649000.

The previous prime is 720146407. The next prime is 720146489. The reversal of 720146431 is 134641027.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 720146431 - 2²¹ = 718049279 is a prime.

It is a super-2 number, since 2×720146431² = 1037221764164075522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 720146431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720146731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2748520 + ... + 2748781.

It is an arithmetic number, because the mean of its divisors is an integer number (181410966).

Almost surely, 2^720146431 is an apocalyptic number.

720146431 is a deficient number, since it is larger than the sum of its proper divisors (5497433).

720146431 is a wasteful number, since it uses less digits than its factorization.

720146431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5497432.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 720146431 is about 26835.5441718628. The cubic root of 720146431 is about 896.3417059871.

Adding to 720146431 its reverse (134641027), we get a palindrome (854787458).

The spelling of 720146431 in words is "seven hundred twenty million, one hundred forty-six thousand, four hundred thirty-one".